Ok, got a couple more suggestions.
First, put sidewall panels, between the front and rear tires. I'd use coroplast or something of that nature. It's lightweight and water proof.
Second, with a little work, you could take some 1/2 inch pvc pipe, bow it and attach it to the front and back of the vehicle. You could make two or three hoops and then attach coroplast to it, to give you a rounded shape on the front and rear, so that you reduce the turbulance coming off of the motorhome.
On the front you could come up until the windshield. In the back you could come all of the way from the bumper to the top of the motorhome.
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